How to access it and gameplay here
Stick it to the Man! and Zombie Vikings developer Zoink! is already working on a new game simply called FE, and you can play it right now if you own Zombie Vikings.
The above video shows how to access the hidden FE level via an Easter egg involving luring an enemy to a specific area. The FE level can then be selected from the overworld map at any time.
FE is a large departure from the style Zoink! has used so far, as it looks to be a mixture of 3D platformer mixed with stealth gameplay. I’m guessing the thing you control is a flying lizard or squirrel. Looks pretty cool either way, though I think the developer should have finished Zombie Vikings before it started on another game, but what do I know, I just write about games.